UPD78F0386GK-8EU-A Renesas Electronics America, UPD78F0386GK-8EU-A Datasheet - Page 248

• Manufacturer Part Number: UPD78F0386GK-8EU-A
• Description: MCU 96KB FLASH 5KB RAM
• Manufacturer: Renesas Electronics America
• Series: 78K0/Lx2r

Specifications of UPD78F0386GK-8EU-A

• Core Processor: 78K/0
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: 3-Wire SIO, I²C, LIN, UART/USART
• Peripherals: LCD, LVD, POR, PWM, WDT
• Number Of I /o: 26
• Program Memory Size: 96KB (96K x 8)
• Program Memory Type: FLASH
• Ram Size: 5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

10.4.3 Setting window open period of watchdog timer
byte (0080H). The outline of the window is as follows.
246
Set the window open period of the watchdog timer by using bits 6 and 5 (WINDOW1, WINDOW0) of the option
Example: If the window open period is 25%
Caution The first writing to WDTE after a reset release clears the watchdog timer, if it is made before the
The window open period to be set is as follows.
Counting
starts
If “ACH” is written to WDTE during the window open period, the watchdog timer is cleared and starts counting
again.
Even if “ACH” is written to WDTE during the window close period, an abnormality is detected and an internal
reset signal is generated.
Cautions 1. The combination of WDCS2 = WDCS1 = WDCS0 = 0 and WINDOW1 = WINDOW0 = 0
overflow time regardless of the timing of the writing, and the watchdog timer starts counting
again.
WINDOW1
0
0
1
1
Internal reset signal is generated
if ACH is written to WDTE.
Window close period (75%)
2. The watchdog timer does not stop during self-programming of the flash memory and
Table 10-4. Setting Window Open Period of Watchdog Timer
is prohibited.
EEPROM emulation. During processing, the interrupt acknowledge time is delayed.
Set the overflow time and window size taking this delay into consideration.
WINDOW0
0
1
0
1
25%
50%
75%
100%
CHAPTER 10 WATCHDOG TIMER
User’s Manual U17504EJ2V0UD
Window Open Period of Watchdog Timer
Counting starts again when
ACH is written to WDTE.
Window open
period (25%)
Overflow
time